/*
 * @(#)$Id: codetemplate_xbird.xml 943 2006-09-13 07:03:37Z yui $
 * 
 * Copyright 2006-2008 Makoto YUI
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 * 
 * Contributors: Makoto YUI - initial implementation
 */
package jacky.lanlan.song.io.stream;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * 
 * @author Makoto YUI (yuin405+xbird@gmail.com)
 */
public final class FastBufferedOutputStream extends FilterOutputStream {

	private byte buf[];

	private int count;

	public FastBufferedOutputStream(OutputStream out) {
		this(out, 8192);
	}

	public FastBufferedOutputStream(OutputStream out, int size) {
		super(out);
		if (size <= 0) { throw new IllegalArgumentException("Buffer size <= 0"); }
		buf = new byte[size];
	}

	@Override
	public void write(int b) throws IOException {
		if (count >= buf.length) {
			flushBuffer();
		}
		buf[count++] = (byte) b;
	}

	@Override
	public void write(byte b[], int off, int len) throws IOException {
		if (len >= buf.length) {
			flushBuffer();
			out.write(b, off, len);
			return;
		}
		if (len > buf.length - count) {
			flushBuffer();
		}
		System.arraycopy(b, off, buf, count, len);
		count += len;
	}

	@Override
	public synchronized void flush() throws IOException {
		flushBuffer();
		out.flush();
	}

	private void flushBuffer() throws IOException {
		if (count > 0) {
			out.write(buf, 0, count);
			count = 0;
		}
	}
}